Landscape configuration of an Amazonian island-like ecosystem drives population structure and genetic diversity of a habitat-specialist bird
| Autor: | John M. Bates, Juliana Menger, Cintia Cornelius, Camila Duarte Ritter, Jean Paul Metzger, Sérgio Henrique Borges, Christine D. Bacon, Camila C. Ribas |
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| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
Geography Planning and Development Population Context (language use) 010603 evolutionary biology 01 natural sciences 03 medical and health sciences PÁSSAROS education 030304 developmental biology Nature and Landscape Conservation 0303 health sciences Genetic diversity education.field_of_study Ecology Resistance (ecology) biology Elaenia ruficeps biology.organism_classification Geography Habitat Landscape ecology Biologie Genetic isolate Tropical rainforest |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| ISSN: | 1572-9761 0921-2973 |
| Popis: | Context Amazonian white-sand ecosystems (campinas) are open vegetation patches which form a natural island-like system in a matrix of tropical rainforest. Due to a clear distinction from the surrounding matrix, the spatial characteristics of campina patches may affect the genetic diversity and composition of their specialized organisms, such as the small and endemic passerine Elaenia ruficeps. Objectives To estimate the relative contribution of the current extension, configuration and geographical context of campina patches to the patterns of genetic diversity and population structure of E. ruficeps. Methods We sampled individuals of E. ruficeps from three landscapes in central Amazonia with contrasting campina spatial distribution, from landscapes with large and connected patches to landscapes with small and isolated patches. We estimated population structure, genetic diversity, and contemporary and historical migration within and among the three landscapes and used landscape metrics as predictor variables. Furthermore, we estimated genetic isolation by distance and resistance within landscapes. Results We identified three genetically distinct populations with asymmetrical gene flow among landscapes and a decreasing migration rate with distance. Within each landscape, we found low differentiation without genetic isolation by distance nor by resistance. In contrast, we found differentiation and spatial correlation between landscapes. Conclusions Together with previous studies, the population dynamics of E. ruficeps suggests that both regional context and landscape structure shape the connectivity among populations of campina specialist birds. Also, the spatial distribution of Amazonian landscapes, together with their associated biota, has changed in response to climatic changes in the Late Pleistocene. |
| Databáze: | OpenAIRE |
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